cal20 cradle specs

Greets: My new old cal-20 finally made it to the farm. Now its time to build a cradle for her. Anyone have specs for a standard bunk cradle. Want to use this exercise to learn how to weld. Basically it should be a 5x8 from with upright of a specific length supporting two bunks front and rear using using the tick stick method Chris C wrote about a long time back. To keep it simple, was wondering if anyone had either specs or the dimensions for the upprights so that the buld rests reasonably comfortably. Best regards and thanks. PS: The 29 that was inpected was a good boat for someone, but not for my intended use, so walked aways from it, regrettably. /ch